Killing Floor vs Starve.io
Killing Floor
Killing Floor is an intense survival horror first-person shooter game that is set in the post-apocalyptic and devastatingly ruined country of England where a series of military-sanctioned cloning experiments had gone awry. Play with up to 6 of your friends cooperatively as you attempt to survive for long enough to clear the area you are airdropped into of any zombies or you can simply play solo. Unlike most similar games, Killing Floor has a non-linear gameplay where you can actually weld doors shut to redirect waves of zombies. The gameplay is also more tactically sound rather than the bullet-hell stuff you'd experience in some of the more arcade-like shooters.In addition to having an arsenal of weapons for you to choose from, the game also features a persistent perks system which lets you to convert your in-game achievements into permanent improvements for your character's skills and abilities. The game even has mod support, so you can create new levels and mods for the game and share them with the world.
Killing Floor may be a rather old game, but it's still as fun as it was before. The cooperative gameplay guarantees hours of fun (as well as yelling and perhaps cussing) for both you and your friends as you try to stem the tide of zombies rushing towards you.
Starve.io
Starve.io is a unique IO game mainly because it is more of a base-building and survival game rather than just a hack-and-slash arena. In this game, you will need to collect resources and turn them into useful items which will marginally improve your chances of survival. The crafting aspect of the game is very much simplified but it can still take you a while to figure out crucial crafting details like how much resources you need to create a certain item. Also, a quick tip if you will - grab as much food and wood as you can at the get-go.As a survival game, there are several important "meters" that you will need to keep an eye on, such as temperature and hydration. Hunger also something that you will need to frequently deal with, aside from other potentially hostile players as well as other monsters like vampires and zombies if you happen to play its other game modes. There is even a "hunger games" version which frankly feels a lot like a battle royale game.
Unlike many other IO games where players are always pitted against one another, Starve.io is a game in which you can actually choose to coexist with other players rather than just swinging whatever weapon you have in hand at anyone you see... though, many players still do that pretty often, especially those better-equipped ones.